CN115479403B - Control method and device for Stirling refrigerator and refrigeration equipment - Google Patents

Control method and device for Stirling refrigerator and refrigeration equipment Download PDF

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Publication number
CN115479403B
CN115479403B CN202110587183.1A CN202110587183A CN115479403B CN 115479403 B CN115479403 B CN 115479403B CN 202110587183 A CN202110587183 A CN 202110587183A CN 115479403 B CN115479403 B CN 115479403B
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phase
phase difference
frequency
phase voltage
flux linkage
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CN115479403A (en
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吕凯雄
刘占杰
陈海涛
唐先双
包海平
王路
孟凡丰
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Qingdao Haier Biomedical Co Ltd
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Qingdao Haier Biomedical Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/12—Stator flux based control involving the use of rotor position or rotor speed sensors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • H02P21/141—Flux estimation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/06—Linear motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/14—Compression machines, plants or systems characterised by the cycle used 
    • F25B2309/1428—Control of a Stirling refrigeration machine

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Linear Motors (AREA)

Abstract

The application relates to the technical field of refrigeration equipment control, and discloses a control method for a Stirling refrigerator, wherein the Stirling refrigerator is provided with a linear oscillating motor, and the method comprises the following steps: acquiring phase voltage and phase current of the linear oscillating motor; carrying out low-pass filtering treatment on the phase current; integrating the phase voltage and the phase current after the low-pass filtering treatment to generate a stator flux linkage associated with the linear oscillating motor; analyzing the stator flux linkage to generate a permanent magnet flux linkage; acquiring a phase difference between the phase current and the permanent magnet flux linkage; and adjusting the frequency of the phase voltage according to the association relation between the phase difference, the phase voltage frequency and the running state of the linear oscillating motor. The method can ensure that the Stirling refrigerator has optimal efficiency in the full working condition range. The application also discloses a control device for the Stirling refrigerator and refrigeration equipment.

Description

Control method and device for Stirling refrigerator and refrigeration equipment
Technical Field
The present application relates to the field of refrigeration equipment control technology, for example, to a control method and apparatus for a stirling refrigerator, and a refrigeration equipment.
Background
At present, the core component of the Stirling refrigerator is a linear oscillation motor which mainly comprises three types of moving coil type, moving iron type and moving magnetic type, and the working principle of the motor is that a rotor drives a compression piston to do simple harmonic vibration, and an expansion piston is driven by a pneumatic spring to lag the compression piston by a certain phase, so that refrigeration is realized by approximate Stirling cycle.
The traditional Stirling refrigerator control system adopts a bipolar SPWM (Sinusoidal Pulse Width Modulation ) control method of H-bridge intermittent control or H-bridge complementary control, and forms a closed loop or protection by detecting the temperature of the cold and hot ends and the vibration of the machine body. This control method basically enables the control of the stirling cooler, but suffers from the following drawbacks: in order to realize the high-efficiency operation of the Stirling refrigerator, the frequency of the phase voltage of the linear oscillating motor is adjusted to be equal to the natural frequency of the Stirling refrigerator, however, in the operation process of the Stirling refrigerator, the working condition is changed, the fixed frequency is also changed while the working condition is changed, the traditional Stirling refrigerator control system still adopts the frequency equal to the fixed frequency to control the frequency of the phase voltage, thus the Stirling refrigerator cannot be operated at high efficiency, the Stirling refrigerator is difficult to control in the optimal operation state,
in the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
the conventional Stirling refrigerator control system cannot ensure that the Stirling refrigerator is optimal in efficiency in the full working condition range.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.
The embodiment of the disclosure provides a control method, a control device and refrigeration equipment for a Stirling refrigerator, so as to ensure that the Stirling refrigerator has optimal efficiency in a full working condition range.
In some embodiments, the Stirling refrigerator is configured with a linear oscillating motor, the method comprising: acquiring phase voltage and phase current of the linear oscillating motor; performing low-pass filtering treatment on the phase current; integrating the phase voltage and the phase current subjected to low-pass filtering treatment to generate a stator flux linkage associated with the linear oscillating motor; analyzing the stator flux linkage to generate a permanent magnet flux linkage; acquiring a phase difference between the phase current and the permanent magnet flux linkage; and adjusting the frequency of the phase voltage according to the association relation between the phase difference, the phase voltage frequency and the running state of the linear oscillating motor.
In some embodiments, the adjusting the frequency of the phase voltage according to the association relationship between the phase difference, the frequency of the phase voltage and the running state of the linear oscillating motor includes: determining a reference phase difference according to the frequency of the phase voltage; if the phase difference is located outside a preset range associated with the reference phase, acquiring a difference value between the phase difference and the reference phase difference; adjusting the frequency of the phase voltage according to the difference between the phase difference and the reference phase difference; and determining a new phase difference and a new reference phase difference according to the frequency of the adjusted new phase voltage so that the new phase difference is in a preset range related to the new reference phase difference.
In some embodiments, the adjusting the frequency of the phase voltage according to the difference between the phase difference and the reference phase difference comprises: if the difference is greater than the upper limit of the preset range, reducing the frequency of the phase voltage; and if the difference value is smaller than the lower limit of the preset range, increasing the frequency of the phase voltage.
In some embodiments, after adjusting the frequency of the phase voltage according to the difference value, further comprising: controlling the linear oscillating motor to run continuously at the frequency of the regulated phase voltage in a preset period; according to the frequency of the regulated new phase voltage, new phase current, new permanent magnet flux linkage and new phase difference corresponding to the new phase current and the new permanent magnet flux linkage are obtained again; and if the new phase difference is stable, continuing to adjust the frequency of the new phase voltage according to the association relation of the phase difference, the phase voltage frequency and the running state of the linear oscillating motor until the new phase difference is positioned in the preset range associated with the new reference phase difference.
In some embodiments, the Stirling cooler is further configured with a piston, the method further comprising: determining the amplitude of the permanent magnet flux linkage; if the amplitude of the permanent magnet flux linkage indicates that the piston has a cylinder collision risk, determining a target amplitude of the phase voltage according to a positive correlation between a piston stroke and the amplitude of the phase voltage; and adjusting the amplitude of the phase voltage to the target amplitude.
In some embodiments, the piston is determined to have a cylinder collision risk in the following manner: and if the amplitude of the permanent magnet flux linkage is larger than the reference amplitude of the permanent magnet flux linkage, determining that the piston has a cylinder collision risk, wherein the reference amplitude corresponds to the preset stroke of the piston.
In some embodiments, the phase voltages and low-pass filtered phase currents are integrated using a low-pass filtered integrator to generate a stator flux linkage.
In some embodiments, the Stirling refrigerator is configured with a linear oscillating motor, the apparatus comprising: the preprocessing module is configured to acquire phase voltage and phase current of the linear oscillating motor and perform low-pass filtering processing on the phase current; an integration module configured to receive the phase voltage and the low-pass filtered phase current and integrate them to generate a stator flux linkage associated with the linear oscillating motor; the analysis module is configured to analyze the stator flux linkage to generate a permanent magnet flux linkage associated with the linear oscillation motor; a phase difference detection module configured to acquire a phase difference of the phase current and the permanent magnet flux linkage; and the frequency correction module is configured to adjust the frequency of the phase voltage according to the association relation of the phase difference, the frequency of the phase voltage and the running state of the linear oscillating motor.
In some embodiments, the apparatus comprises a processor and a memory storing program instructions, the processor being configured, when executing the program instructions, to perform a control method for a Stirling refrigerator as previously described.
In some embodiments, the refrigeration apparatus includes a control device for a Stirling refrigerator as previously described.
The control method and device for the Stirling refrigerator and the refrigeration equipment provided by the embodiment of the disclosure can realize the following technical effects:
after the phase voltage and the phase current of the linear oscillation motor are obtained, the phase current is subjected to low-pass filtering firstly, then the phase voltage and the phase current subjected to low-pass filtering are subjected to integral processing to generate a stator flux linkage associated with the linear oscillation motor, then the stator flux linkage is analyzed to generate a permanent magnet flux linkage, then the phase difference corresponding to the phase of the phase current and the phase of the permanent magnet flux linkage is obtained, and finally the frequency of the phase voltage is regulated according to the phase difference, the phase voltage frequency and the association relation of the running state of the linear oscillation motor. When the linear oscillating motor operates at the highest efficiency, the difference value between the phase current and the phase of the permanent magnet flux linkage is about 90 degrees, so that the phase difference between the phase current after adjustment and the phase difference between the phase current after adjustment and the phase difference between the phase difference and the phase difference of the phase difference are about 90 degrees, the linear oscillating motor operates at the highest efficiency within the full working condition range, and the working efficiency of the Stirling refrigerator is further improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:
FIG. 1 is a schematic diagram of a control method for a Stirling refrigerator provided in an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another control method for a Stirling cooler provided in an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another control method for a Stirling cooler provided by embodiments of the present disclosure;
FIG. 4 is a schematic diagram of another control method for a Stirling cooler provided by embodiments of the present disclosure;
FIG. 5 is a schematic diagram of a control device for a Stirling cooler provided in accordance with an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a current curve of a phase current and a flux curve of a permanent magnet flux provided by an embodiment of the present disclosure;
fig. 7 is a schematic diagram of another control device for a stirling cooler provided in an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.
The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated.
In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.
As shown in connection with fig. 1, an embodiment of the present disclosure provides a control method for a stirling cooler configured with a linear oscillating motor. The method comprises the following steps:
and S01, acquiring the phase voltage and the phase current of the linear oscillating motor.
S02, performing low-pass filtering treatment on the phase current;
s03, integrating the phase voltage and the phase current subjected to the low-pass filtering treatment to generate a stator flux linkage associated with the linear oscillating motor.
S04, analyzing the stator flux linkage to generate a permanent magnet flux linkage.
S05, obtaining the phase difference between the phase current and the permanent magnet flux linkage.
S06, adjusting the frequency of the phase voltage according to the association relation of the phase difference, the phase voltage frequency and the running state of the linear oscillating motor.
After the phase voltage and the phase current of the linear oscillating motor are obtained, the phase current is subjected to low-pass filtering firstly, then the phase voltage and the phase current subjected to low-pass filtering are subjected to integral processing to generate a stator flux linkage associated with the linear oscillating motor, then the stator flux linkage is analyzed to generate a permanent magnet flux linkage, then a phase difference corresponding to the phase of the phase current and the phase of the permanent magnet flux linkage is obtained, and finally the frequency of the phase voltage is adjusted according to the phase difference, the association relation between the phase voltage frequency and the running state of the linear oscillating motor. When the linear oscillating motor operates at the highest efficiency, the difference between the phase current and the phase of the permanent magnet flux linkage is about 90 degrees, so that the phase difference between the phase current after adjustment and the phase difference between the phase current and the phase difference of the permanent magnet flux linkage are about 90 degrees through the mode, the linear oscillating motor operates at the highest efficiency in the full working condition range, and the working efficiency of the Stirling refrigerator is further improved.
Optionally, referring to fig. 2, adjusting the frequency of the phase voltage according to the association relationship between the phase difference, the frequency of the phase voltage and the running state of the linear oscillating motor includes:
s11, determining a reference phase difference according to the frequency of the phase voltage.
S12, if the phase difference is out of the preset range related to the reference phase difference, acquiring a difference value between the phase difference and the reference phase difference.
S13, adjusting the frequency of the phase voltage according to the difference value of the phase difference and the reference phase difference.
S14, determining a new phase difference and a new reference phase difference according to the frequency of the regulated phase voltage so that the new phase difference is in a preset range related to the new reference phase difference.
Thus, since the linear oscillating motor operates most efficiently when the phase difference between the phase current and the permanent magnet flux linkage is about 90 degrees, the reference phase difference may be a quarter of the period of the phase voltage by determining the reference phase difference according to the frequency of the phase voltage. If the phase difference is located outside the preset range corresponding to the reference phase difference, the frequency of the phase voltage is adjusted according to the difference value of the phase difference and the reference phase difference, so that the new phase difference determined after adjustment is located in the preset range associated with the new reference phase difference.
As an example, the phase voltage has a frequency f s The period of the phase voltage corresponding to the frequency is T s . The Stirling refrigerator is provided with a linear oscillating motor. The linear oscillating motor is electrically connected to a control system configured with a timer module.
Phase difference T 0 In an ideal case, the number of the components,
Figure BDA0003088156620000061
in actual adjustment, the phase difference T 0 Adjusting within a preset range corresponding to the reference phase difference, wherein the width of the preset range is delta, namely +.>
Figure BDA0003088156620000062
Wherein T is mcu Representing the clock period of the timer module. For example, timer moduleThe clock frequency is 1MHz, T mcu 1 μs.
Optionally, adjusting the frequency of the phase voltage according to the difference value includes:
if the difference is greater than the upper limit of the preset range, the frequency of the phase voltage is reduced.
If the difference is smaller than the lower limit of the preset range, the frequency of the phase voltage is increased.
The preset range is determined by the type of the linear oscillation motor and/or the clock period of the timer module and/or the expected phase difference precision and/or the application scene of the linear oscillation motor.
Optionally, the preset range is
Figure BDA0003088156620000071
Wherein T is mcu And the meaning of the equation is that xi is the expected phase difference precision, which means that the range of + -xi% of the period can be reached.
Optionally, the value of ζ is 0< ζ <2.
As an example, f s ＝50Hz，T mcu =1μs, ζ=1, the preset range is [ -200,200]Thereby, it is determined that the upper limit of the preset range is 200 and the lower limit of the preset range is-200.
If the difference is greater than the upper limit 200 of the predetermined range, i.e
Figure BDA0003088156620000072
Then f is reduced s 。
If the difference is smaller than the lower limit of the preset range to 200, namely
Figure BDA0003088156620000073
Then increase f s 。
In practical applications, the single adjustment amplitude of the frequency of the phase voltage satisfies the following condition:
the single adjustment amplitude is A, and the amplitude is determined by the type of the linear oscillating motor and the application scene of the linear oscillating motor.
Alternatively, A is more than or equal to 0.1Hz and less than or equal to 0.5Hz. Therefore, the working efficiency of the direct current oscillating motor is not affected by improper single adjustment amplitude, and the reliability of the Stirling refrigerator in operation is higher.
As an example, as shown in connection with fig. 6, the phase difference may be determined by a current curve of the phase current and a flux curve of the permanent magnet flux linkage.
As shown in connection with fig. 3, the presently disclosed embodiments also provide a control method for a stirling cooler configured with a linear oscillating motor. The method comprises the following steps:
s21, acquiring the phase voltage and the phase current of the linear oscillating motor.
S22, performing low-pass filtering treatment on the phase current;
s23, integrating the phase voltage and the phase current subjected to the low-pass filtering treatment to generate a stator flux linkage associated with the linear oscillating motor.
S24, analyzing the stator flux linkage to generate a permanent magnet flux linkage.
S25, obtaining the phase difference between the phase current and the permanent magnet flux linkage.
S26, determining a reference phase difference according to the frequency of the phase voltage.
S27, if the phase difference is out of the preset range corresponding to the reference phase difference, obtaining a difference value between the phase difference and the reference phase difference.
S28, adjusting the frequency of the phase voltage according to the difference value of the phase difference and the reference phase difference.
S29, controlling the linear oscillating motor to run continuously at the frequency of the regulated phase voltage in a preset period.
S30, re-acquiring the new phase current, the new permanent magnet flux linkage and the new phase difference corresponding to the new phase current and the new permanent magnet flux linkage according to the frequency of the adjusted new phase voltage.
And S31, if the new phase difference is stable, continuing to adjust the frequency of the new phase voltage according to the association relation of the phase difference, the phase voltage frequency and the running state of the linear oscillating motor until the new phase difference is positioned in a preset range associated with the new reference phase difference.
By adopting the control method for the Stirling refrigerator, which is provided by the embodiment of the disclosure, after the frequency of the phase voltage is regulated, the frequency phase of the phase current is also changed, the frequency phase of the permanent magnet flux is also changed, and further the phase difference is also changed. The phase difference is directly obtained after the frequency of the phase voltage is regulated, the phase difference is not stable enough, the phase difference can only represent the phase difference at the moment of obtaining the phase difference, and whether the phase difference is stable cannot be accurately reflected, so that a new phase current, a new permanent magnet flux linkage corresponding to the phase current and the phase difference of the new phase current are continuously obtained, and if the phase difference is stable, the frequency of the new phase voltage is regulated according to the association relation of the phase difference, the frequency of the phase voltage and the running state of the linear oscillating motor until the new phase difference is positioned in a preset range associated with the new reference phase difference. Therefore, more accurate phase difference can be obtained, and the accuracy of frequency adjustment of the phase voltage is improved.
Optionally, the new phase difference stability is determined as follows:
after the linear oscillating motor runs for a preset period with a new phase current, an average value of the new phase difference in continuous N periods is obtained.
If the difference between the new phase difference acquired in the continuous N periods and the average value is within the allowable error range, the new phase difference is determined to be stable. The allowable error range may be preset according to an application scenario of the linear oscillating motor.
Optionally, the value range of N is more than or equal to 2 and less than or equal to 5.
As shown in connection with fig. 4, the presently disclosed embodiments also provide a control method for a stirling cooler configured with a linear oscillating motor and a piston. The method comprises the following steps:
s41, acquiring the phase voltage and the phase current of the linear oscillating motor.
S42, performing low-pass filtering treatment on the phase current;
s43, integrating the phase voltage and the phase current subjected to the low-pass filtering treatment to generate a stator flux linkage associated with the linear oscillating motor.
S44, analyzing the stator flux linkage to generate a permanent magnet flux linkage.
S45, determining the amplitude of the permanent magnet flux linkage.
S46, if the amplitude of the permanent magnet flux linkage indicates that the piston has a cylinder collision risk, determining a target amplitude of the phase voltage according to a positive correlation relation between the piston stroke and the amplitude of the phase voltage, and adjusting the amplitude of the phase voltage to the target amplitude.
S47, obtaining the phase difference between the phase current and the permanent magnet flux linkage.
S48, adjusting the frequency of the phase voltage according to the association relation of the phase difference, the phase voltage frequency and the running state of the linear oscillating motor.
The method comprises the steps of generating a permanent magnet flux linkage, determining the amplitude of the permanent magnet flux linkage, determining the target amplitude of the phase voltage according to the corresponding relation between the stroke of the piston and the amplitude of the phase voltage when the piston has a cylinder collision risk, and adjusting the amplitude of the phase voltage to the target amplitude. The step of acquiring the phase difference between the phase current and the permanent magnet flux linkage may be performed when the operation efficiency of the linear oscillating motor needs to be adjusted, or may be performed simultaneously with the step of determining the amplitude of the permanent magnet flux linkage in the case where the operation efficiency of the linear oscillating motor is unknown. The embodiments of the present disclosure are not particularly limited thereto.
The conventional piston stroke requires the installation of different types of sensors at the associated positions of the piston, including one or more of a position sensor, an acceleration sensor and a special detection winding, which increases the structural complexity of the stirling cooler and reduces the operational reliability of the stirling cooler.
By adopting the control method for the Stirling refrigerator, provided by the embodiment of the disclosure, the stroke of the piston refers to the maximum amplitude of the piston, and the stroke of the piston has a positive correlation with the amplitude of the phase voltage. When the amplitude of the permanent magnet flux linkage indicates that the piston has a cylinder collision risk, the amplitude of the piston is determined to be overlarge, at this time, according to the positive correlation between the piston stroke and the amplitude of the phase voltage, the target amplitude of the phase voltage is determined, and then the amplitude of the phase voltage is adjusted to be the target amplitude. Therefore, the stroke of the piston can be regulated by regulating the amplitude of the phase voltage, the piston is prevented from collision with a cylinder in the running process of the linear oscillating motor, and the limit protection of the piston is realized on the basis of improving the working efficiency of the Stirling refrigerator. Compared with the traditional piston stroke detection mode, the method improves the running reliability of the Stirling refrigerator.
Optionally, the piston is determined to have a cylinder collision risk in the following manner:
if the magnitude of the permanent magnet flux linkage is greater than the reference magnitude of the permanent magnet flux linkage, determining that the piston has a cylinder collision risk. Wherein the reference amplitude corresponds to a preset stroke of the piston. The preset stroke is the maximum amplitude of the piston without risk of cylinder collision.
Optionally, a low-pass filter integrator is used to integrate the phase voltage and the low-pass filtered phase current to generate the stator flux linkage.
Therefore, the traditional mode of obtaining the stator flux linkage adopts an integrator, the integrator is easy to be interfered by factors such as DC drift, sampling error, impedance change and the like, and due to the existence of the interference factors, the obtained stator flux linkage diverges at a certain moment along with error accumulation, namely the obtained stator flux linkage has poor convergence, and the phase and the amplitude of the stator flux linkage generate larger errors necessarily. The method adopts a low-pass filter integrator to integrate the phase voltage and the phase current after the low-pass filter treatment, and the low-pass filter integrator has the functions of filtering and integrating, and the filtering function can enable the stator flux generated by the integration treatment to have better convergence, so that more accurate stator flux can be obtained.
As an example, the low-pass filter integrator employs a first-order low-pass filter integrator whose transfer function is as follows:
Figure BDA0003088156620000101
wherein omega c Representing the cut-off frequency of the low pass filter integrator.
Optionally, the permanent magnet flux linkage is generated by parsing the stator flux linkage in the following manner:
according to psi r ＝ψ s -L s i s And analyzing the stator flux linkage to obtain the permanent magnet flux linkage.
Wherein L is s Representing the associated inductance value, i, of a linear oscillating motor s Representing the phase current of the low-pass filtering process, ψ r Representing permanent magnet flux linkage, ψ s Representing the stator flux linkage.
Thus, the permanent magnet flux linkage can be obtained from the stator flux linkage, and the amplitude and the phase of the permanent magnet flux linkage can be obtained.
In practice, the refrigeration apparatus is provided with a stirling cooler and a control system. The Stirling refrigerator includes a linear oscillating motor and a piston. The linear oscillating motor is electrically connected with the control system.
The working process of the refrigeration equipment is as follows:
s51, controlling the control system to be electrified, and enabling the refrigeration equipment to enter a starting preparation stage.
S52, the refrigeration equipment receives a starting signal sent by a user, the Stirling refrigerator enters a starting preheating stage, and the controller controls the amplitude of the phase voltage of Stirling to be U 0 The frequency of the phase voltage is the design frequency F 0 。
S53, after the Stirling refrigerator continuously operates for 5-10S in the starting preheating stage, the control system automatically enters an open-loop starting stage, and the frequency of phase voltage in the stage is continuously kept to be F 0 The amplitude of the phase voltage is from U 0 Gradually increasing and the increasing amplitude is linked to the design parameters of the refrigeration equipment.
S54, when the amplitude of the phase voltage is equal to U 0 Increased to U 1 And at the moment, the control system automatically enters an inner loop closed-loop control stage, and at the moment, the amplitude and the frequency of the phase voltage enter the closed-loop control stage.
And S55, the control system detects the phase current of the Stirling refrigerator in real time, integrates the phase voltage and the phase current subjected to low-pass filtering treatment, and generates a stator flux linkage associated with the linear oscillating motor. Then, analyzing the stator flux linkage to generate a permanent magnet flux linkage, and determining the amplitude and the phase of the permanent magnet flux linkage.
S56, the control system pairThe amplitude of the permanent magnet flux linkage is compared with the reference amplitude of the permanent magnet flux linkage, and the amplitude of the permanent magnet flux linkage is judged to be larger than the reference amplitude of the permanent magnet flux linkage, so that the piston is confirmed to have the risk of cylinder collision. At this time, according to the positive correlation between the piston stroke and the amplitude of the phase voltage, the target amplitude U of the phase voltage is determined t The amplitude of the control phase voltage is represented by U 1 Is adjusted to the target amplitude U t 。
S57, the control system corrects the frequency of the phase voltage according to the phase difference between the phase of the phase current and the phase of the permanent magnet flux linkage, so that the phase difference between the phase of the phase current and the phase of the permanent magnet flux linkage is within a preset range corresponding to one fourth of the period of the phase voltage.
As shown in conjunction with fig. 5, the embodiment of the present disclosure also provides a control device for a stirling cooler configured with a linear oscillating motor. The device comprises a preprocessing module 201, an integration module 202, an analysis module 203, a phase difference detection module 204 and a frequency correction module 205. The preprocessing module 201 is configured to acquire a phase voltage and a phase current of the linear oscillating motor, and perform a low-pass filtering process on the phase current. The integration module 202 is configured to receive the phase voltage and the low-pass filtered phase current and integrate them to generate a stator flux linkage associated with the linear oscillating motor. The parsing module 203 is configured to parse the stator flux to generate a permanent magnet flux associated with the linear oscillating motor. The phase difference detection module 204 is configured to obtain a phase difference of the phase current and the permanent magnet flux linkage. The frequency correction module 205 is configured to adjust the frequency of the phase voltage according to the correlation of the phase difference, the phase voltage frequency, and the linear oscillation motor operation state.
By adopting the control device for the Stirling refrigerator, which is provided by the embodiment of the disclosure, the phase position and the phase difference of the regulated phase voltage are approximately 90 degrees, so that the linear oscillating motor operates with the highest efficiency in the full working condition range, and the working efficiency of the Stirling refrigerator is further improved.
As shown in connection with fig. 7, an embodiment of the present disclosure provides a control device for a stirling cooler, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may invoke logic instructions in the memory 101 to perform the control method for the Stirling refrigerator of the above embodiments.
Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.
The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by running program instructions/modules stored in the memory 101, i.e., implements the control method for the Stirling refrigerator in the above-described embodiments.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides a refrigeration device, which comprises the control device for a Stirling refrigerator.
Alternatively, the refrigeration device may be a free piston Stirling refrigeration device.
Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described control method for a Stirling refrigerator.
Embodiments of the present disclosure provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described control method for a Stirling refrigerator.
The computer readable storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
Embodiments of the present disclosure may be embodied in a software product stored on a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or a transitory storage medium.
The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (9)

1. A control method for a stirling cooler equipped with a linear oscillating motor, the method comprising:
acquiring phase voltage and phase current of the linear oscillating motor;
performing low-pass filtering treatment on the phase current;
integrating the phase voltage and the phase current subjected to low-pass filtering treatment to generate a stator flux linkage associated with the linear oscillating motor;
analyzing the stator flux linkage to generate a permanent magnet flux linkage;
acquiring a phase difference between the phase current and the permanent magnet flux linkage;
according to the association relation between the phase difference, the phase voltage frequency and the running state of the linear oscillating motor, the frequency of the phase voltage is regulated;
the adjusting the frequency of the phase voltage according to the association relation between the phase difference, the phase voltage frequency and the running state of the linear oscillating motor comprises the following steps:
determining a reference phase difference according to the frequency of the phase voltage;
if the phase difference is outside a preset range associated with the reference phase difference, acquiring a difference value between the phase difference and the reference phase;
adjusting the frequency of the phase voltage according to the difference between the phase difference and the reference phase difference;
and determining a new phase difference and a new reference phase difference according to the frequency of the adjusted new phase voltage so that the new phase difference is in a preset range related to the new reference phase difference.
2. The method of claim 1, wherein adjusting the frequency of the phase voltage based on the difference between the phase difference and the reference phase difference comprises:
if the difference is greater than the upper limit of the preset range, reducing the frequency of the phase voltage;
and if the difference value is smaller than the lower limit of the preset range, increasing the frequency of the phase voltage.
3. The method of claim 1, wherein after adjusting the frequency of the phase voltage according to the difference value, further comprising:
controlling the linear oscillating motor to run continuously at the frequency of the regulated phase voltage in a preset period;
according to the frequency of the regulated new phase voltage, new phase current, new permanent magnet flux linkage and new phase difference corresponding to the new phase current and the new permanent magnet flux linkage are obtained again;
and if the new phase difference is stable, continuing to adjust the frequency of the new phase voltage according to the association relation of the phase difference, the phase voltage frequency and the running state of the linear oscillating motor until the new phase difference is positioned in the preset range associated with the new reference phase difference.
4. A method as claimed in any one of claims 1 to 3 wherein the stirling cooler is further provided with a piston, the method further comprising:
determining the amplitude of the permanent magnet flux linkage;
if the amplitude of the permanent magnet flux linkage indicates that the piston has a cylinder collision risk, determining a target amplitude of the phase voltage according to a positive correlation between a piston stroke and the amplitude of the phase voltage;
and adjusting the amplitude of the phase voltage to the target amplitude.
5. The method of claim 4, wherein the piston is determined to have a cylinder clash risk in the following manner:
and if the amplitude of the permanent magnet flux linkage is larger than the reference amplitude of the permanent magnet flux linkage, determining that the piston has a cylinder collision risk, wherein the reference amplitude corresponds to the preset stroke of the piston.
6. A method according to any one of claims 1 to 3, wherein the phase voltages and low-pass filtered phase currents are integrated using a low-pass filter integrator to produce a stator flux linkage.
7. A control apparatus for a stirling cooler equipped with a linear oscillating motor, the apparatus comprising:
the preprocessing module is configured to acquire phase voltage and phase current of the linear oscillating motor and perform low-pass filtering processing on the phase current;
an integration module configured to receive the phase voltage and the low-pass filtered phase current and integrate them to generate a stator flux linkage associated with the linear oscillating motor;
the analysis module is configured to analyze the stator flux linkage to generate a permanent magnet flux linkage associated with the linear oscillation motor;
a phase difference detection module configured to acquire a phase difference of the phase current and the permanent magnet flux linkage;
the frequency correction module is configured to adjust the frequency of the phase voltage according to the association relation of the phase difference, the frequency of the phase voltage and the running state of the linear oscillating motor;
the adjusting the frequency of the phase voltage according to the association relation between the phase difference, the phase voltage frequency and the running state of the linear oscillating motor comprises the following steps: determining a reference phase difference according to the frequency of the phase voltage; if the phase difference is outside a preset range associated with the reference phase difference, acquiring a difference value between the phase difference and the reference phase; adjusting the frequency of the phase voltage according to the difference between the phase difference and the reference phase difference; and determining a new phase difference and a new reference phase difference according to the frequency of the adjusted new phase voltage so that the new phase difference is in a preset range related to the new reference phase difference.
8. A control apparatus for a stirling cooler comprising a processor and a memory storing program instructions, wherein the processor is configured, when executing the program instructions, to perform the control method for a stirling cooler of any one of claims 1 to 6.
9. A refrigeration apparatus comprising a control apparatus for a stirling cooler as claimed in claim 7 or 8.
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